Liquid-dispensing pump



W. 'T. HATMAKER.

LIQUID DISPENSING PUMP. APPLICATION FILED SEPT 8. 1919.

1,352,664, PatentedSept. 14,1920.

2 SHEETS-SHEET I.

Fig 2 ATTORNEY w. TJHATMAKER.

LIQUID DISPENSING PUMP.

APPLICATIGN FlLED SEPT. 8. 1919;

INVENTOR. W. 7'. HHTMHKEH.

ATTEJRNEY on!r1511) JSTATIESI PATENT orrics.

WILLIAM n, iiii T'MA ER, or nAY'roiv, OHIO, ru n coMPANY, or DAYTON, o

Specif cation of Letters Patent.

ASSIGNOR TO THE HUFFMAN RECORDING- HIO, A CORPORATION GE OHIO.

' LIQUID-DISPENSING; PUMP.

Patented Sept. 14;, 1920.

Continuation of application filed February 27', l9l9,'Seria1 No. 279,491. This application filed September 8, 1919. Serial No. 322,249.

T0 all whom it mai concern 'Belit-known that I, WVILLIAM T. I'IAT- MAKER, a citizen of the United States, residing at Dayton, in the county of Montgomery: and State of Ohio, have invented certain new and useful Improvements in Liquid-Dispensing Pumps, of which the following isa specification, reference being had therein to the accompanying drawing.

This invention relates to liquid dispensing, pumps and is a continuationof the application filedby me February 27, 1919, Serlal No. 279,491, as to all matter common to the two applications,

Inthe operation of dispensing pumps in which the operating device moves in one direction only, as is the case inthe above mentioned application, difliculty is sometimes encountered, due to the fact that the quantity of liquid required by a customer may involve the delivery of less than a full measure.

For example, where the pump cylinder discharges one gallon upon each full operation of the piston a customer may require seven and one-half gallons, and where this happens the piston remains in an intermediate satisfactory.

position at the end of the dischargeoperation and itis necessary either to discharge and dispose of, in some manner, the liquid that remains in the cylinder above the piston, or to include this part of a measure in theorder of the next customer. Either method is un- If the first is followed, it is necessary to discharge the liquid into a separate receptacle and eventually return it to the tank, and, if the second method is followed, confusion is very liable tobe the result.

The object of the invention isto provide, in a pump of this kind,means for return ing the undischarged portion of liquid remaining in the cvlinder, after a partial operation'of'the piston, to the intake side of the piston.

A further-object of, the invention is to provide, in a pump of this kind, means for rendering the registering mechanism inopcylinder on the erative during the operation. of the pump partly broken away,of such a pump; Fig. 3

is a transverse sectional view taken through the cylinders immediately Fig. 4 is a transverse sectional view, partly broken away, taken through the valve casing on the cylinder head; and Fig. 5 is a detail view of the register operating mecha nlsm.

In these drawings I have shown the invention as embodied in a double cylinder pump, similar to that shown and described in the above mentioned application, but it will be understood that this particular type of pump is chosen for the purpose of illustration only, and that the invention may be applied to pumps of various kinds, either single cylinder or double cylinder pumps.

The pump here illustrated comprises two cylinders 1 and 2, each of which referably has a capacity of one gallon. ounted in each of these cylinders is a valved piston 3, the valve l of which is so arranged that it will be seated upon the discharge stroke and will be opened upon the return stroke of the piston to permit the cylinder above the piston to again fill with liquid. Each piston has connected therewith a piston rod 5, extending beyond the end of the cylinder, and having connected therewith a rack 6, the two racks meshing with the opposite sides of an operating gear 7. This gear is rotated first in one direction and then in the other to alternately raise and lower the respective pistons by means of a suitable actuating device, which, in. the present instance, comprises a crank 8 secured to an operating shaft 9 and connected through suitable gearing with. the operating gear 7. The connections between the shaft and the operating gear are such that the direction of movement 'of the gear may be reversed without reversing the direction of movement of the crank. Thisoperating mechanism is fully described in the above mentioned ap plication and, inasmuch as it forms no part of the present invention, it need not be here described in detail.

The lower ends of the two cylinders communicate, through suitable supply line, with a tank, or other source of liquid supply, which is usually nnder ground. In the present construction the two cylinders are seated on a single base casting, which is provided with two passageways and 10 communicating respectively with the lower ends above the base;

of the cylinders l and and each of the pas- 20 of the by-pas's.

sageways comunicates with a conduit 11, which, in turn, is connected by a pipe 12 with the source of supply. T he communication between the conduit 11 and each passageway 9 and 10 is controlled by a check of liquid to the respective cylinders upon the upward stroke of the piston and will close, to prevent the escape of the liquid, upon the downward stroke of the piston. The upper, or discharge ends, of the cylinders, are preferably connected with a single discharge pipe, and in the present construction, a single head casting 1 1 is provided to receive the upper ends of both cylinders, and this head casting has a transverse passageway 15 communicating with the discharge ends of both cylinders and connected with the discharge pipe 16.

In order that the undischarged portion of a measure of liquid may be returned to the cylinder on the intake side of the piston, when the delivery has been completed with the piston in intermediate position, I have provided a bypass, or connit, 17, lead ing from the discharge end of the cylinder to the intake end thereof and have provided means for controlling this by-pass. In a double cylinder pump, such as is here shown, 1 prefer to use a single by-pass for both cylinders and thisis very easily accomplished in the present instance by connecting the same with the passag way 15 in the head casting,

which passageway communicates with both cylinders. "lhe my-pass may be connected with the intake end of the cylinder either directly or through a part of the supply line and in the ease of the double cylinder pump here shown .l prefer to connect the lower end of the by pass with the conduit 11, as in this manner it may be connected, through the check valves 13, with either cylinder. The by-pass may be connected with the cylinders, or head casting, 15, in any suitable manner, but, in the present instance, I have connected the bypass with the head casting through the opening leading to the discharge pipe. To this end the discharge opening leads into the casing 18 oi": a controlling valve, which casing is provided with a port 19 for the discharge pipe and a port 20 for the by-pass. lwlounted in said casing is a suitable three any valve 21, which is here shown in the form of a rotary plug valve having an axial opening in line with the discharge opening of the head casting and having outlet ports to connect the axial opening with either the port 19 of the disc iarge line, or the port The openings, or ports, i n the valve member are so arranged that the valve ma be set in an intermediate position in which both the by-pass and the discharge line will be out ch from the cylinders, and the pistons in the cylinders consequently locked against movement. The discharge vc 13, which will open to permit the flowopening and valve casing may be arranged in any suitable position with relation to the head casting, but, as a matter of convenience, I have here shown them arranged centrally of the casting with the stem 22 of the valve 21 extending vertically above the casing 18. It will be apparent, therefore, that when the operator has completed the delivery of the required amount-of liquid before the piston has completed its discharge movement, he will interrupt the movement of the operating device, or crank, and adjust the valve 21 to disconnect the cylinder from the discharge pipe a-ndconnect it with the by pass, and will then further operate the crank to complete the movement of the piston, the

liquid from the cylinder passing through the bv-pass to the supply line and thence again to the cylinder. I i l I have also provided means for rendering the registering device inoperative and thus preserving an accurate record-of the liquid actually delivered to customers. The registering device may take various forms and may be operated in different ways, but, in the present machine, it comprises a dial 223 having thereon figures representing the number of gallons delivered and the cost of each quantity delivered. Traveling over this dial is a pointer 24 which is operatively connected with the operating mechanism for the pump. To this end, the pointer is rotatably mounted on a shaft 25 and has connected therewith a ratchet wheel 26 with which cooperates a pawl 27 carried by an arm 28 loosely mounted on the shaft 25 for movement relatively to the ratchet wheel and the pointer. he arm 28 is connected, by means of a rod 29, to an arm 30 pivotally mounted on a fixed part of thesupporting frame and arranged to be actuated by a cam 31, which is connected with the operating gear 7. This cam is so shaped that it will impart, to the arm 30, and consequently to the pawl 27, sufiicient movement to advance the pointer throu h one full indication on the dial for one complete movement ofthe piston of either cylinder. Inasmuch as the cylinders in the present instance contain one gallon each, each complete movement of the pointer represents one gallon. However, the cam 31 is so shaped and the awl and ratchet 27 and 26 are of such'a c aracter that this movement will be imparted to the pointer in four equal parts, each part .representin one quart. To prevent the operation l this registering device when-the cylinder is discharging to the by-pass- I have provided means for rendering thepawl 27 inoperative and this means is preferably so connected with the valve which controls the bypnss that the pawl will be automatically ren; (lei-ed operative or inoperative when the valve is shifted. To this end I have connected with the rod 29, which actuates the pawl 27, a rod 32, the'lower end of which 'The arrangement of the cam is such that when the handle 35 is actuated to connect the by-pass with the cylinder, the pawl will be'llfted into, and-retained in, its elevated position, thus rendering the registering duit.

mechanism inoperative, and will remain in this position until the valve is returned to its normal position, that is, the position in which the discharge pipe is connected with the cylinder. I

lVhile I have described this mechanism as applied to a registering device, it will be obvious that it may be utiiized for rendering inoperative either a registering-device or a recordingdevice, or both,

While'I have shown one embodiment of my invention, I wish it to he understood that I do not desire to be limited to the deta'ils'thereof, as various modifications may occur to a person skilled in the art.

Having now fully described my invention 'what I claim as new and desire to secure by 7 Letters Patent, is: I

1. In a liquid dispensing apparatus, 2. cylinder having a discharge opening'at one end, a piston mounted insai'dcylinder, a conduit to connect said discharge opening with said cylinder on the intake side of said piston, and thereby permit the liquid remaining inthe cylinder after an incomplete stroke of the piston, to be returned to the intake end of the cylinder, and means to con trol the passage f liquid'through said con- 2; In a liquid dispensing-apparatus, a cylinder, a piston mounted in said cylinder, a discharge conduit for said cylinder, a conduit to connect the discharge end of said cylinder with the intake end thereof and thereby permit the liquid remaining in the cylinder after an incomplete stroke of the piston to be returned to the intake end of the cylinder, and means to connect said discharge end of said cylinder with the last mentioned conduit and to disconnect said cylinder from the first mentioned conduit.

3. In a liquid dispensing apparatus, a cylinder having a discharge conduit, a piston in' said cylinder, a discharge conduit adapted to be connected with said discharge opening to connect the discharge end of said cylinder with the intake end thereof, and

thereby permit the liquid remaining in the of said conduits with said discharge ipening.

4. In a liquid dispensing pump, two cylinand to connect one of said cylinders with the second mentioned conduit.

5. In a liquid dispensing pump, two cylinders, a piston mounted in each cylinder, asingle outlet opening for both cylinders, a supply line leading to both cylinders, a conduit connected with said supply line, and means for connecting said conduit with said discharge opening.-

6. In a liquid dispensing apparatus, two cylinders, a supply line communicating with both of said cylinders, a single head for closing the discharge ends of both' of said cylinders, said head having a discharge openingcommunicating with both cylinders, a discharge conduit adapted to be connected .with. said discharge opening, a second conduit adapted to be connected with said discharge opening and leading to said supplyline, and means to connect either of said conduits with said discharge opening.

7. In a liquid dispensing apparatus, two cylinders, a supply line communicating with the intake ends of both cylinders, a head for closing the discharge ends of said cylinders, said head having a discharge opening com:

municating with both cylinders, a valve casing communicating with said discharge opening, a discharge condult connected with said valve casing, and a second conduit concharge end of said cylinder, a registering device to register the operations of said piston, and means for rendering said re istering device inoperative when said conduit is connected with the discharge end of said cylinder. 9. In a liquid dispensing apparatus, a cylinder, a piston mounted in said cylinder, a conduit to connect the discharge end of said cylinder with the intake end thereof, a valve to control said conduit, a registering device to register the operations of said piston, means actuated by said valve to render said registering device inoperative when said valve is actuated to connect the discharge end of said cylinder with the intake end thereof.

10. In a liquid dispensing apparatus, a

cylinder, a piston mounted therein, a conduit to connect the discharge end of said cylinder with the intake end thereof, a valve to control said conduit, a registering device to register the operations of said piston and comprising pawl and ratchet operating mechanism, and an operative connection between said pawl and said valve to cause the pawl to be moved into an inoperative position when said valve is actuated to connect the discharge end of said cylinder with the intake end thereof.

11. In a liquid dispensing apparatus, a cylinder, a piston mounted in said cylinder, a conduit to connect the discharge end of said cylinder with the intake end thereof, a valve to control said conduit, a registering device to register the operations of said piston, a cam operatively connected with said valve and means actuated by said cam.

to render said registering mechanism in0perative when said valve is actuated to connect the discharge end of said cylinder with the intake end thereof.

12. In a liquid dispensing apparatus, two cylinders, pistons mounted in said cylinders, a supply line leading to the intake ends of said cylinders, a head to close the discharge ends of both of said cylinders and having a discharge opening communicating with both cylinders, a valve casing mounted on said head in communication with -'said discharge opening, a discharge conduit connected with said valve casing, a second conduit connected with said valve casing and leading to said supply line, a valve member mounted in said casing to connect said discharge opening with either of said conduits, registering mechanism to register the operations of both of said pistons, a cam operatively connected with said valve member, and means actuated by said cam to render said registering mechanism inoperative when said valve member is operated to connect said discharge opening with said supply line.

13. In a liquid dispensing apparatus, two cylinders, pistons mounted in said cylinders, a supply line leading to the intake ends of said cylinders, a head to close the discharge ends of both of said cylinders and having a discharge opening communicating with both cylinders, a valve casing mounted on said head in communication with said discharge opening, a discharge conduit connected with said valve casing, a second conduit connected with said valve casing and leading to said supply line, a valve member mounted in said casing to connect said discharge opening with either of said conduits, registering mechanism to register the operations of both of said pistons and comprising an operating pawl, a handle for actuating said valve member, a cam connected with said handle, and a part arranged to be actuated by said cam to move said pawl into an inoperative position when said valve member is actuated to connect said discharge opening with said supply line.

In testimony whereof, I afiix my signature hereto.

WILLIAM T. HATMAKER. 

